Executive Summary

CVE-2026-4282 is a high-severity vulnerability in Keycloak caused by a flaw in the SingleUseObjectProvider component, which acts as a global key-value store without proper type or namespace isolation.

This flaw allows an unauthenticated attacker to forge authorization codes.

By exploiting these forged codes, the attacker can create access tokens with administrative privileges, leading to privilege escalation within the system.

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Impact Analysis

The vulnerability can allow an unauthenticated attacker to escalate their privileges by forging authorization codes and generating admin-capable access tokens.

This means an attacker could gain administrative access to your Keycloak environment, potentially compromising the security and integrity of your system.

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Mitigation Strategies

The vulnerability in Keycloak's SingleUseObjectProvider allows unauthenticated attackers to forge authorization codes and escalate privileges. Immediate mitigation steps include applying any available security patches or updates provided by Keycloak or your Linux distribution vendor.

Since the vulnerability affects all Linux environments running Keycloak and no specific version is mentioned, it is critical to monitor official Keycloak and Red Hat advisories for patches or workarounds.

Additionally, consider restricting network access to Keycloak instances, enforcing strict access controls, and monitoring for suspicious authorization code usage to reduce the risk of exploitation.

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